Ex4 : Find the mistake in each of the fllowing sentences anh correct it.
1. We did not spent our summer holiday in dalat last year._____________
2. My brother often has three- weeks summer vacation._______________
3. Does Nam have little stamps than Viet?________________
4. Chi usually spends two hours to do her homework every evening._____________
5. What did you bought at the souvenr store yesterday?_________________
6. When i was saw her, I thought she looked happily.________________
7. Did you not understand what I said to you